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土的工程力学性质的颗粒流模拟
引用本文:周健,池永.土的工程力学性质的颗粒流模拟[J].固体力学学报,2004,25(4):377-382.
作者姓名:周健  池永
作者单位:1. 同济大学地下建筑与工程系,上海,200092
2. 浦东新区建设局,上海,200135
基金项目:国家自然科学基金(50178054),上海市重点学科建设项目资助.
摘    要:基于颗粒流理论,引入不同的颗粒接触连接本构模型,分别建立了砂土和粘性土的颗粒流模型.通过颗粒流数值模型试验,对砂土和粘性土的室内平面应变试验及其剪切带形成和发展进行了数值模拟,分别对比了不同围压下颗粒流试样与室内试验的应力应变关系曲线,基本再现了砂土和粘性土试样应力.应变关系.通过砂土和粘性土PFC试样剪切带模拟表明,当围压较小时试样内部颗粒位移量小而且分布范围较广,当围压增大时,试样内部颗粒位移量也增大,而且发生较大位移颗粒的分布范围趋于集中,同时随着围压的增大试样内部形成明显的剪切带.无论砂土还是粘性土的PFC试样,随着围压的增加剪切带的形状趋于集中,而且剪切带宽度在减小.在围压很小时,试样内形成大的破坏区域,在围压较大时出现明显的线破坏区.这些规律基本与室内试验结果相似。

关 键 词:围压  砂土  粘性土  剪切带  颗粒流模拟  平面应变试验  颗粒流理论  试样  内部  应力应变关系
修稿时间:2002年12月23

SIMULATING SOIL PROPERTIES BY PARTICLE FLOW CODE
Zhou Jian,Chi Yong.SIMULATING SOIL PROPERTIES BY PARTICLE FLOW CODE[J].Acta Mechnica Solida Sinica,2004,25(4):377-382.
Authors:Zhou Jian  Chi Yong
Institution:Zhou Jian 1 Chi Yong 2
Abstract:The properties of soil can be simulated in mesomechanical level by particle flow code(PFC), and the macro properties of soil can be analyzed by researching meso parameters of PFC model. Based on PFC theory, sand and clay numerical models are constituted, in which different contact bond constitutive relation are introduced. The plane strain test of sand and clay are simulated by particle flow code (PFC) respectively, and also the results of PFC and lab test with different confining stresses are compared and discussed. The macrocosmic stress strain relation of the sand and clay can be reproduced by the PFC numerical model. The simulating results of shear bands show that a shear band of shear bands begin before the peak stress condition, and that even before the clear formation of shear bands the deformation within a PFC sample if not uniform with degree of non uniformity being larger at a lower confining stress. In contrast fo this, the concentration degree of deformation to a shear band or shear bands was larger at larger confining stress and the average width of shear band was smaller at a larger confining stress. The large damage scope is formed at the small confining and line damage appeared at the larger confining.
Keywords:sand  clay  mesomechanics  particle flow code  stress-strain relation  shear band
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